Pickup1
PU_ST1
TRST1
tReset1
t1
ANSI10000040-3-en.vsd
ANSI10000040 V3 EN
Figure 90:
Example for Definite Time Delay stage1 operation
9.1.7.3
Blocking
It is possible to block Two step undervoltage protection UV2PTUV (27) partially or
completely, by binary input signals or by parameter settings, where:
BLOCK:
blocks all outputs
BLKTR1:
blocks all trip outputs of step 1
BLK1:
blocks all pickup and trip outputs related to step 1
BLKTR2:
blocks all trip outputs of step 2
BLK2:
blocks all pickup and trip outputs related to step 2
If the measured voltage level decreases below the setting of
IntBlkStVal1
, either the trip
output of step 1, or both the trip and the PICKUP outputs of step 1, are blocked. The
characteristic of the blocking is set by the
IntBlkSel1
parameter. This internal blocking can
also be set to
Disabled
resulting in no voltage based blocking. Corresponding settings and
functionality are valid also for step 2.
In case of disconnection of the high voltage component the measured voltage will get very
low. The event will PICKUP both the under voltage function and the blocking function,
as seen in figure
. The delay of the blocking function must be set less than the time delay
of under voltage function.
Section 9
1MRK 511 365-UUS A
Voltage protection
280
Phasor measurement unit RES670 2.1 ANSI
Technical manual
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